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                        | (84) | Designated Contracting States: |  
                        |  | AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
                           NO PL PT RO RS SE SI SK SM TR |  
 
                     
                        | (30) | Priority: | 06.12.2011 US 201161567220 P 
 |  
 
                     
                        | (71) | Applicants: |  
                        |  | 
                              Schlumberger Technology B.V.2514 JG  The Hague (NL)
 
 AL AT BG CH CY CZ DE DK GR HR HU IE IT LI LT NO PL RO SI SK TR
Schlumberger Holdings LimitedTortola 1110 (VG)
 
 GB NL
Services Pétroliers Schlumberger75007 Paris (FR)
 
 FR
PRAD Research and Development LimitedRoad Town, Tortola 1110 (VG)
 
 BE EE ES FI IS LU LV MC MK MT PT RS SE SM
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 | 
                     
                        | (72) | Inventor: |  
                        |  | 
                              XIE, Cheng-gangCambridge
                                 Cambridgeshire CB3 0EL (GB)
 |  
 
                     
                        | (74) | Representative: Ford, Michael Frederick |  
                        |  | Schlumberger Cambridge Research Limited 
                           High Cross 
                           Madingley Road Cambridge CB3 0EL
 Cambridge CB3 0EL (GB)
 |  
 |